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Preparation method of single-component room-temperature-vulcanized silicone rubber

A technology of room temperature vulcanization and silicone rubber, which is applied in the field of preparation of one-component room temperature vulcanization silicone rubber, to achieve the effects of increasing corrosion resistance, long service life and wide application range

Active Publication Date: 2014-06-11
SICHUAN KELIXIN NEW MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, there is no way to combine silicone rubber with cast stone powder to produce corrosion-resistant silicone rubber

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0029] A preparation method of one-component room temperature vulcanized silicone rubber includes the following steps:

[0030] A. After mixing the base rubber and calcium powder evenly, heat and stir to defoam to make the base material;

[0031] B. After mixing the cast stone powder, carbon black and silicone oil evenly, heat and stir to defoam to make color paste;

[0032] C. Cool the base material and color paste to room temperature, mix and grind them, add them to the planetary stirring tank to drain bubbles;

[0033] D. Add the cross-linking agent and stir evenly and then drain the bubbles, and then add the cross-linking agent again and stir evenly to drain the bubbles;

[0034] E. Add thickener and catalyst, stir evenly, discharge bubbles, filter and discharge to obtain single-component room temperature vulcanized silicone rubber.

[0035] The inventors of the present invention have discovered through research that the use of calcium powder alone as a filler will result in poo...

Embodiment 1

[0044] Mix 107 glue with a consistency of 10000mPa*s and 107 glue with a consistency of 80,000mPa*s in a 9:1 ratio to make a base gum. After mixing 100 parts of base gum with 50 parts of nano-active calcium carbonate, stir and drain at 120°C. Bubble (vacuum degree ≤ -0.08MPa) 1.5h to make base material. After mixing the cast stone powder, post-treatment carbon black and 350mPa*s ethyl silicone oil in a ratio of 0.5:0.5:1, stir and defoam at 120℃ (vacuum ≤-0.08MPa) for 1.5h to make color paste. Add the base material and the color paste into a three-roller mixing mill at a ratio of 3:1 to mix, add the mixture to a planetary stirring tank, and drain the bubbles for 45 minutes. Add 2 parts of methyltrimethoxysilane for the first time, stir well and drain for 15min, add 2 parts of methyltrimethoxysilane and 1 part of vinyltrimethoxysilane for the second time, stir well and drain for 15min, and finally Add 1 part of thickener and 0.05 part of catalyst, stir evenly and drain for 45 ...

Embodiment 2

[0047] Except the composition of the color paste is different, the rest is the same as in Example 1.

[0048] After mixing the cast stone powder, post-treatment carbon black and 350mPa*s dimethyl silicone oil in a ratio of 1:1:1, stir and defoam at 120°C (vacuum ≤-0.08MPa) for 1.5h. Color paste.

[0049] Experimental results: the appearance is fine, uniform paste, without bubbles, skin and gel; surface drying time 54min, curing time 8h; maximum elongation rate 185%, tensile strength 0.83, 100% tensile strength 0.72, The tensile modulus at 23°C is 0.57MPa, the elastic recovery rate is 82%, the fixed-stretch adhesion is not damaged after immersion in the corrosive solution, and the mass loss rate after immersion is 2.5%.

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Abstract

The invention discloses a preparation method of single-component room-temperature-vulcanized silicone rubber. The method comprises the steps that: A, base rubber and calcium powder are well mixed; and the mixture is subjected to heating, stirring, and defoaming, such that a base material is prepared; B, casting stone powder, carbon black and silicone oil are well mixed; and the mixture is subjected to heating, stirring, and defoaming, such that a color paste is prepared; C, the base material and the color paste are cooled to room temperature; the materials are mixed and grinded; and the mixture is defoamed in a planetary stirring vessel; D, a cross-linking agent is added and the mixture is well mixed; defoaming is carried out; the cross-linking agent is added again and the mixture is well mixed; and defoaming is carried out; and E, a thickening agent and a catalyst are added, and the mixture is well mixed; defoaming is carried out; and the material is filtered and discharged, such that the single-component room-temperature-vulcanized silicone rubber is obtained. The method provided by the invention has the advantages that: the obtained product has excellent performances and high anti-corrosion performance.

Description

Technical field [0001] The invention relates to the field of organic silicon sealant manufacturing, in particular to a preparation method of one-component room temperature vulcanized silicone rubber. Background technique [0002] Silicone rubber has the characteristics of excellent sealing performance, strong aging resistance, strong adhesion, high and low temperature resistance and non-toxicity, which makes silicone rubber can be widely used in construction, electronics, automotive, military, aerospace and solar photovoltaic industries. However, the existing silicone rubber has weak corrosion resistance. If the actual environment of the silicone rubber product is corrosive (for example, the silicone rubber sealant used on the exterior wall of the building is corroded by acid rain), it will cause the product to fall off or Peeling, seriously shortening the life of the product, brings inconvenience to production and life. [0003] Cast stone powder, also known as chlorpyroxene powd...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L83/04C08K13/02C08K3/26C08K3/36C08K3/04C08K5/5415C08K5/5419C08K5/5425C08J3/24
Inventor 孙建厅
Owner SICHUAN KELIXIN NEW MATERIALS CO LTD
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